<H1> SDSS 2.5 M optical design</H1>

<h1> Spectroscopic Mode</h1>
This is design kmg001 taken from Steve Kent's file.  (Internally,
I call it gunn06.dat.)  My copy dates from July 14, 1996.
Refraction indices, where given, refer to just
one wavelength, but the design was optimized for 3900-9000 A.;  Curvature
is the inverse of radius of curvature that is normally given for an optical
design.  I give absolute z positions rather than the more convential spacing
to the next optical element.

<pre>

Here are my surface definitions:

Surface
 1.0	Primary
 3.0	Secondary
 4.0	Front of common corrector
 5.0	Back of common corrector
 8.0	Front of spectroscopic corrector
 9.0	Back of spectroscopic corrector
10.0	Focal plane

Wave.     X Pos     Y pos    X rad    Y rad   Scale Factor Rot. Dist. Map  Wgt
0.48      0.00      0.00      327.00   327.00   16.5338   0.0000 0.00   0  0.0

Surf   Curvature    Con Con  Z pos     OFFSETS        TILTS          FILT/INDX
 0.0                                                                     1.0000
 1.0   -8.889e-05  -1.285      0.00     0.0     0.0   0.000   0.000   3 -1.0000
 3.0    -0.000139 -11.968  -3644.46     0.0     0.0   0.000   0.000   3  1.0000
 4.0            0   0.000    -24.55     0.0     0.0   0.000   0.000   3  1.4637
 5.0            0   0.000    -12.55     0.0     0.0   0.000   0.000   3  1.0000
 8.0   -0.0004307   0.000    660.09     0.0     0.0   0.000   0.000   3  1.4637
 9.0            0   0.000    670.09     0.0     0.0   0.000   0.000   3  1.0000
10.0            0   0.000    756.70     0.0     0.0   0.000   0.000   3  1.0000

Surf        A2         A4         A6         A8         A10   In Stop Out Stop
 1.0           0          0  3.814e-22 -1.518e-29          0     0.00 -1251.82
 3.0           0          0  1.785e-19          0          0     0.00  -540.36
 4.0   2.321e-05 -1.173e-10 -7.873e-17  1.592e-22          0     0.00  -361.94
 5.0           0          0          0          0          0     0.00  -361.60
 8.0           0          0          0          0          0     0.00  -332.06
 9.0  -7.747e-05 -4.123e-10  -6.53e-15  5.234e-20 -1.222e-25     0.00  -332.33
10.0   -4.02e-06 -3.834e-10  1.189e-15          0          0     0.00  -327.81
</pre>


<h1> Imaging Mode</h1>
The official copy of this design may be found at
<a href=http://www.apo.nmsu.edu/Telescopes/SDSS/eng.papers/19950322_Optical_Design/19950322.html#aa1> APO </a>
This is design kent003 taken from Steve Kent's file.
My copy dates from Aug. 24, 1995.
This gives the design for a corner "r" band CCD.
Curvature
is the inverse of radius of curvature that is normally given for an optical
design.  I give absolute z positions rather than the more convential spacing
to the next optical element.

<pre>

Here are my surface definitions:

Surface
 1.0	Primary
 2.0	Secondary
 4.0	Front of common corrector
 5.0	Back of common corrector
 6.0	Front of imaging corrector
 7.0	Back of imaging 
11.10	Front of filter
12.10	Back of filter
13.10	Back of field flattener
14.10	Focal plane

Wave.     X Pos     Y pos    X rad    Y rad   Scale Factor Rot. Dist. Map  Wgt
0.63      -62.93    35.96     -24.60   -24.60   16.5030   -0.0001 0.00   1  0.0

Surf   Curvature    Con Con  Z pos     OFFSETS        TILTS          FILT/INDX
 0.0                                                                     1.0000
 1.0   -8.889e-05  -1.285      0.00     0.0     0.0   0.000   0.000  10 -1.0000
 2.0    -0.000139 -11.968  -3646.14     0.0     0.0   0.000   0.000  10  1.0000
 4.0            0   0.000    -24.55     0.0     0.0   0.000   0.000  10  1.4576
 5.0            0   0.000    -12.55     0.0     0.0   0.000   0.000  10  1.0000
 6.0            0   0.000    701.45     0.0     0.0   0.000   0.000  10  1.4576
 7.0            0   0.000    746.45     0.0     0.0   0.000   0.000  10  1.5147
11.10           0   0.000    746.45  -227.5   130.0   0.000   0.000  10  1.5147
12.10           0   0.000    749.45  -227.5   130.0   0.000   0.000  10  1.5147
13.10    0.001493   0.000    751.45  -227.5   130.0   0.000   0.000  10  0.9997
14.10     0.00043   0.000    759.04  -227.5   130.0   2.622   0.020  10  0.9997

Surf        A2         A4         A6         A8         A10   In Stop Out Stop
 1.0           0          0  3.814e-22 -1.518e-29          0     0.00 -1251.82
 2.0           0          0  1.785e-19          0          0     0.00  -539.95
 4.0   2.321e-05 -1.173e-10 -7.873e-17  1.592e-22          0     0.00  -361.04
 5.0           0          0          0          0          0     0.00  -360.69
 6.0  -0.0002732  2.056e-09 -5.809e-15  1.746e-20          0     0.00  -329.59
 7.0           0          0          0          0          0     0.00  -327.13
11.10          0          0          0          0          0     0.00   -36.91
12.10          0          0          0          0          0     0.00   -36.66
13.10          0          0          0          0          0     0.00   -36.41
14.10          0          0          0          0          0     0.00   -36.29
</pre>
<P>
A limited tolerance analysis given <a href=ray.tolerance.html>here</a>.
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